> On Sep 30, 2015, at 6:41 AM, lyf4 Science <[email protected]> wrote: > > Hi Experts, > > I tried sending a data of size 100 bytes in the control OUT request from MAC > OS X 10.10 to a USB device. > > First 64 bytes are transmitted successfully in a transfer, the remaining 36 > bytes are transfered but the device sends back "NAK" token and the driver API > returns timeout without attempting to PING and transmit back.
What speed is the device? Which sort of controller is this on? (UHCI, OHCI, EHCI, XHCI) Does the host attempt multiple OUTs, which are NAKed, or is there nothing? > How to fix the same ? If there are OUTs, I’m not sure the host is doing anything wrong, you may need to fix the device. _______________________________________________ Do not post admin requests to the list. They will be ignored. Usb mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/usb/archive%40mail-archive.com This email sent to [email protected]
